cfb.XORKeyStream(ciphertext, plaintext)

		if !bytes.Equal(ciphertext, expected) {
			t.Errorf("#%d: wrong output: got %x, expected %x", i, ciphertext, expected)
		}

		cfbdec := cipher.NewCFBDecrypter(block, iv)
		plaintextCopy := make([]byte, len(ciphertext))
		cfbdec.XORKeyStream(plaintextCopy, ciphertext)

		if !bytes.Equal(plaintextCopy, plaintext) {

// size.
func NewCFBEncrypter(block Block, iv []byte) Stream {
	return newCFB(block, iv, false)
}

// NewCFBDecrypter returns a [Stream] which decrypts with cipher feedback mode,
// using the given [Block]. The iv must be the same length as the [Block]'s block
// size.
func NewCFBDecrypter(block Block, iv []byte) Stream {
	return newCFB(block, iv, true)
}

func newCFB(block Block, iv []byte, decrypt bool) Stream {

	benchmarkAESStream(b, cipher.NewCFBEncrypter, make([]byte, almost1K))
}

func BenchmarkAESCFBDecrypt1K(b *testing.B) {
	benchmarkAESStream(b, cipher.NewCFBDecrypter, make([]byte, almost1K))
}

func BenchmarkAESCFBDecrypt8K(b *testing.B) {
	benchmarkAESStream(b, cipher.NewCFBDecrypter, make([]byte, almost8K))
}

func BenchmarkAESOFB1K(b *testing.B) {
	benchmarkAESStream(b, cipher.NewOFB, make([]byte, almost1K))
}

}
func TestCFBEncryptOutOfBoundsWrite(t *testing.T) {
	testBlock(t, "CFB Encrypt", cipher.NewCFBEncrypter)
}
func TestCFBDecryptOutOfBoundsWrite(t *testing.T) {
	testBlock(t, "CFB Decrypt", cipher.NewCFBDecrypter)
}
func testBlock(t *testing.T, name string, newCipher func(cipher.Block, []byte) cipher.Stream) {
	// This cipherText is encrypted "0123456789"
	cipherText := []byte{86, 216, 121, 231, 219, 191, 26, 12, 176, 117}

		cbcd.CryptBlocks(ct, pt[:0])
		assertEqual("CBC decrypt", ct, pt)

		cfbe := cipher.NewCFBEncrypter(b, iv)
		cfbe.XORKeyStream(ct, pt[:0])
		assertEqual("CFB encrypt", ct, pt)

		cfbd := cipher.NewCFBDecrypter(b, iv)
		cfbd.XORKeyStream(ct, pt[:0])
		assertEqual("CFB decrypt", ct, pt)

		ctr := cipher.NewCTR(b, iv)
		ctr.XORKeyStream(ct, pt[:0])
		assertEqual("CTR", ct, pt)

		ofb := cipher.NewOFB(b, iv)

	if len(ciphertext) < aes.BlockSize {
		panic("ciphertext too short")
	}
	iv := ciphertext[:aes.BlockSize]
	ciphertext = ciphertext[aes.BlockSize:]

	stream := cipher.NewCFBDecrypter(block, iv)

	// XORKeyStream can work in-place if the two arguments are the same.
	stream.XORKeyStream(ciphertext, ciphertext)
	fmt.Printf("%s", ciphertext)
	// Output: some plaintext
}

		{"(StreamWriter).Write", Method, 0},
		{"AEAD", Type, 2},
		{"Block", Type, 0},
		{"BlockMode", Type, 0},
		{"NewCBCDecrypter", Func, 0},
		{"NewCBCEncrypter", Func, 0},
		{"NewCFBDecrypter", Func, 0},
		{"NewCFBEncrypter", Func, 0},
		{"NewCTR", Func, 0},
		{"NewGCM", Func, 2},
		{"NewGCMWithNonceSize", Func, 5},
		{"NewGCMWithTagSize", Func, 11},
		{"NewOFB", Func, 0},
		{"Stream", Type, 0},

pkg crypto/aes, type KeySizeError int
pkg crypto/cipher, func NewCBCDecrypter(Block, []uint8) BlockMode
pkg crypto/cipher, func NewCBCEncrypter(Block, []uint8) BlockMode
pkg crypto/cipher, func NewCFBDecrypter(Block, []uint8) Stream
pkg crypto/cipher, func NewCFBEncrypter(Block, []uint8) Stream
pkg crypto/cipher, func NewCTR(Block, []uint8) Stream
pkg crypto/cipher, func NewOFB(Block, []uint8) Stream